From 2dbcb98817736a738a21c31cb90c346ba04e10fb Mon Sep 17 00:00:00 2001
From: Jacob Schmidt <innovativestudios@outlook.com>
Date: Mon, 16 Feb 2026 20:26:40 -0600
Subject: [PATCH] feat: Add Windows-only terrain SVG export functionality via
 FFI with configurable rendering options.

---
 arma/server/extension/src/terrain.rs | 40 ++++++----------------------
 1 file changed, 8 insertions(+), 32 deletions(-)

diff --git a/arma/server/extension/src/terrain.rs b/arma/server/extension/src/terrain.rs
index aad479b..675ee63 100644
--- a/arma/server/extension/src/terrain.rs
+++ b/arma/server/extension/src/terrain.rs
@@ -12,19 +12,11 @@ mod windows_ffi {
     #[link(name = "kernel32")]
     unsafe extern "system" {
         pub(super) fn GetModuleHandleA(lpModuleName: *const u8) -> *mut c_void;
-        pub(super) fn LoadLibraryA(lpLibFileName: *const u8) -> *mut c_void;
         pub(super) fn GetProcAddress(hModule: *mut c_void, lpProcName: *const u8) -> *mut c_void;
     }
 
-    /// Mangled C++ name for the ExportSVG function.
-    /// Format: `?ExportSVG@@YAXPEBD_N11111@Z` matches signature:
-    /// `void ExportSVG(const char*, bool, bool, bool, bool, bool, bool)`
     pub(super) const EXPORT_SVG_PROC_NAME: &[u8] = b"?ExportSVG@@YAXPEBD_N11111@Z\0";
 
-    /// Name of the DLL containing the ExportSVG function.
-    /// Update this to match your actual DLL name.
-    pub(super) const TERRAIN_DLL_NAME: &[u8] = b"TerrainExport.dll\0";
-
     pub(super) type FnExportSVG =
         extern "system" fn(*const c_char, bool, bool, bool, bool, bool, bool) -> *const c_void;
 }
@@ -63,35 +55,20 @@ pub fn export_terrain_svg(
     unsafe {
         use windows_ffi::*;
 
-        // Try to get already loaded module, or load the DLL
-        let module = GetModuleHandleA(TERRAIN_DLL_NAME.as_ptr());
-        let module = if module.is_null() {
-            let loaded = LoadLibraryA(TERRAIN_DLL_NAME.as_ptr());
-            if loaded.is_null() {
-                return Err(format!(
-                    "Failed to load DLL: {}",
-                    std::str::from_utf8_unchecked(&TERRAIN_DLL_NAME[..TERRAIN_DLL_NAME.len() - 1])
-                ));
-            }
-            loaded
-        } else {
-            module
-        };
-
-        // Get the ExportSVG function address
-        let export_svg_proc = GetProcAddress(module, EXPORT_SVG_PROC_NAME.as_ptr());
-        if export_svg_proc.is_null() {
-            return Err("Failed to find ExportSVG function in DLL".to_string());
+        let module = GetModuleHandleA(std::ptr::null());
+        if module.is_null() {
+            return Err("Failed to get game engine module handle".to_string());
         }
 
-        // Convert to function pointer
-        let export_svg: FnExportSVG = std::mem::transmute(export_svg_proc);
+        let export_svg_proc = GetProcAddress(module, EXPORT_SVG_PROC_NAME.as_ptr());
+        if export_svg_proc.is_null() {
+            return Err("Failed to find ExportSVG function in game engine".to_string());
+        }
 
-        // Convert file path to C string
+        let export_svg: FnExportSVG = std::mem::transmute(export_svg_proc);
         let file_path_cstr =
             std::ffi::CString::new(file_path).map_err(|e| format!("Invalid file path: {}", e))?;
 
-        // Call the export function
         export_svg(
             file_path_cstr.as_ptr(),
             draw_location_names,
@@ -164,7 +141,6 @@ struct ExportSvgOptions {
 /// ["terrain:exportSVG", [toJSON _options]] call forge_x_extension_fnc_extCall;
 /// ```
 fn export_svg(options_json: String) -> String {
-    // Parse options from JSON
     let options: ExportSvgOptions = match serde_json::from_str(&options_json) {
         Ok(opts) => opts,
         Err(e) => {